eroflex Circuit T
echnology
Data Bus Modules For The Future SCD15330 REV B 7/28/99
Features
MIL-STD-1553 Compatible
1.25 Megabit/sec Maximum Data Rate
Sync Identification and Lock-in
Clock Recovery
Manchester II Encode / Decode
Separate Encoder and Decoder Sections
Low Operating Power
Military Temperature Range -55C to +125C
Monolithic Single Chip Construction
Available in Commercial and Industrial Temperature Ranges
Several Package and Quality Options (Consult Factory for Details)
Direct Replacement for the Obsolete Harris HD15530-9/-2/8 and GEC Plessey Marconi
MA15530 / MAS15530 parts
1
General Description
The ACT15530 is a high performance CMOS integrated circuit used to implement MIL-STD-1553 and
similar Manchester II encoded, time division multiplexed, serial data protocols. The device is divided into
two independent sections, encoder and decoder, with a common master reset. The function of the encoder
section is to produce the sync pulse and parity bit, and encode the data bits. The decoder section recognizes
the sync pulse, decodes the data bits and checks for parity.
The ACT15530 is fully guaranteed to support the 1 MHz data rate of MIL-STD-1553 over the full
temperature and supply voltage ranges. The device interfaces with CMOS, TTL or N-Channel support
circuitry and operates from a standard 5 volt supply. The circuit can also be used in many party line digital
data communications applications where high reliability command and control signals are required. Using
Aeroflex transceivers products (4400 Series) the Bit Error Rates (BER) and Word Error Rates (WER) of
MIL-STD-1553 can be achieved (Refer to MIL-STD-1553 Multiplex Applications Handbook
"MIL-HDBK-1553").
CMOS Manchester Encoder / Decoder
CIRCUIT TECHNOLOGY
www.aeroflex.com
V
DD
Encoder Clock
Send Clock In
Send Data
Sync Select
Encoder Enable
Serial Data In
Bipolar One Out
Output Inhibit
Bipolar Zero Out
6 Out
Master Reset
Valid Word
Encoder Shift Clock
Take Data
Serial Data Out
Decoder Clock
Bipolar Zero In
Bipolar One In
Unipolar Data In
Decoder Shift Clock
Command/Data Sync
Decoder Reset
V
SS
Figure 1: Pin Assignments
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
ACT15530
(24-Pin DIP/Flat Package See Figure 18 for LCC Pkg)
Aeroflex Circuit Technology
SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700
2
Master Reset
Vss
Send Clock In
6 Out
V
DD
Output Inhibit
6
6
Encoder
Clock
Bit
Former
Character
Send
Data
Send
Data In
Encoder
Enable
Sync
Select
Encoder
Shift
Clock
Bipolar One Out
Bipolar Zero Out
23
14
22
13
12
21
2
18
19
20
15
17
16
24
8
6
3
4
1
9
5
7
10
13
11
Unipolar Data In
Bipolar One In
Bipolar Zero In
Decoder Clock
Master Reset
Command / Data Sync
Take Data
Serial Data Out
Valid Word
Decoder Shift Clock
Decoder Reset
Finder
Transition
Counter
Check
Parity
Identifier
Character
Figure 2: Encoder Block Diagram
Figure 3: Decoder Block Diagram
Clock
Bit Rate
Synchronizer
Bit Counter
2
2
Note: All Pin designations are for 24-Pin DIP & Flatpak
Note: All Pin designations are for 24-Pin DIP & Flatpak
Aeroflex Circuit Technology
SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700
3
Pin Designations
Pin
Input
Output
Enc
Dec
Function
Comment
1
Valid word
A 'high' signals the receipt of a valid word
2
Encoder Shift Clock
Shifts data into the encoder on a 'low' to 'high'
transition
3
Take Data
'high' during data reception after the sync pulse is
identified
4
Serial Data Out
NRZ output of received data
5
Decoder clock
Clock for the transition finder and synchronizer which
generates the clock for the rest of the decoder
6
Bipolar Zero In
Should be 'high' when the bus is in a negative state.
Must be tied 'high' when the unipolar input is used
7
Bipolar One In
Should be 'high' when the bus is in a positive state.
Must be tied 'low' when the unipolar input is used
8
Unipolar Data In
Input for unipolar data to the transition finder. Must be
tied 'low' when not used
9
Decoder Shift Clock
Provides the DECODER CLOCK divided by 12,
synchronized by the recovered serial data
10
Command/Data Sync
This output indicates the type of synchronizing
character received as follows: If a data synchronizing
character was received, this pin is low while the data
is decoded. If a command synchronizing character
was received, this pin is high during data decoding
11
Decoder Reset
A 'high' during a DECODER SHIFT CLOCK rising
edge resets the bit counter
12
V
SS
Ground
13
Master Reset
A 'high" clears the counters in both sections
14
6 Out
Provides the ENCODER CLOCK divided by 6
15
Bipolar Zero Out
Provides an active 'low' output to the zero or negative
sense of a bipolar line driver
16
Output Inhibit
A 'low' inhibits the BIPOLAR ZERO OUT and
BIPOLAR ONE OUT by forcing them to inactive, 'high',
states
17
Bipolar One Out
Provides an active 'low' output to the one or positive
sense of a bipolar line driver
18
Serial Data In
Receives serial data at the rate of the ENCODER
SHIFT CLOCK
19
Encoder Enable
A 'high' starts the encode cycle provided that the
previous cycle is complete
20
Sync Select
A 'high' selects the command sync and a 'low' selects
the data sync
21
Send Data
Provides an active 'high' to enable the external serial
data source
22
Send Clock In
Clock input at 2 times the data rate
23
Encoder Clock
Input to the divide by 6 circuit
24
V
DD
Positive Supply
Figure 4: Pin Designations (24-Pin Dip/FlatPack)
Aeroflex Circuit Technology
SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700
4
DC Characteristics and Ratings
Absolute Maximum Ratings
Parameter
Min
Max
Units
V
DD
3
7
V
Input Voltage
Vss - 0.3
V
DD
+ 0.3V
V
Operating Temperature
-55
+125
C
Storage Temperature
-65
+150
C
Figure 5: Absolute Maximum Ratings
DC Characteristics
Sym
Parameter
Min
Typ
Max
Units
Test
Conditions
V
IH
Logic "1" Input Voltage
70%V
DD
-
-
V
V
IL
Logic "0" Input Voltage
-
-
30%V
DD
V
V
IHC
Logic "1" Input Voltage (Clock)
V
DD
- 0.5V
-
-
V
V
ILC
Logic "0" Input Voltage (Clock)
-
-
V
SS
+ 0.5V
V
I
IL
Input Leakage Current
-1.0
+1.0
A
0V < V
IN
< V
DD
V
OH
Logic "1" Output Voltage
2.4
-
-
V
I
OH
= -3 mA
V
OL
Logic "0" Output Voltage
-
-
0.4
V
I
OL
= 1.8 mA
I
DDSB
Standby Supply Current
-
0.5
2.0
mA
Output Open
V
IN
= V
DD
=
5.5V
I
DDOP
Operating Supply Current
-
8.0
10.0
mA
V
DD
= 5.5V,
f = 1MHz
C
IN
Input Capacitance
-
5.0
7.0
pF
C
OUT
Output Capacitance
-
8.0
10.0
pF
V
DD
= 5V 10%, over full operating temperature range.
Figure 6: DC Characteristics
Aeroflex Circuit Technology
SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700
5
AC Characteristics
Sym
Parameter
Limits
Figure 7: Encoder Electrical
Characteristics
Min
Max
Units
f
EC
Encoder clock frequency
0
15
MHz
f
ESC
Send clock frequency
0
2.5
MHz
t
ECR
Encoder clock rise time
-
8
ns
t
ECF
Encoder clock fall time
-
8
ns
f
ED
Data rate
0
1.25
MHz
t
MR
Master reset pulse width
150
-
ns
t
E
1
Shift clock delay
-
125
ns
t
E
2
Serial data setup time
75
-
ns
t
E
3
Serial data hold time
75
-
ns
t
E
4
Enable setup time
90
-
ns
t
E
5
Enable pulse width
100
-
ns
t
E
6
Sync setup time
55
-
ns
t
E
7
Sync pulse width
150
-
ns
t
E
8
Send data delay
0
50
ns
t
E
9
Bipolar output delay
-
130
ns
1. V
DD
= 5V 10%, over full operating temperature range. 2. C
L
=50pF.
Sym
Parameter
Limits
Figure 8: Decoder Electrical
Characteristics
Min
Typ
Max
Units
f
DC
Decoder clock frequency
0
-
15
MHz
t
DCR
Decoder clock rise time
-
-
8
MHz
t
DCF
Decoder clock fall time
-
-
8
ns
f
DD
Data rate
0
-
1.25
MHz
t
DR
Decoder reset pulse width
150
-
-
ns
t
DRS
Decoder reset setup time
75
-
-
ns
t
MR
Master reset pulse width
150
-
-
ns
t
D
1
Bipolar data pulse width
t
DC
+ 10
-
-
ns
t
D
2
Sync transition span
-
18t
DC
-
ns
t
D
3
One-Zero overlap
-
-
t
DC
- 10
ns
t
D
4
Short data transition span
-
6t
DC
-
ns
t
D
5
Long data transition span
-
12t
DC
-
ns
t
D
6
Sync delay (on)
-20
-
110
ns
t
D
7
Take data delay (on)
0
-
110
ns
t
D
8
Serial data out delay
-
-
80
ns
t
D
9
Sync delay (off)
0
-
110
ns
t
D
10
Take data delay (off)
0
-
110
ns
t
D
11
Valid word delay
0
-
110
ns
1. V
DD
= 5V 10%, over full operating temperature range. 2. C
L
=50pF.
3. t
DC
= Decoder clock period = 1/f
DC
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